Restore local WebRTC defaults and CI stream profile

[DjDeveloperr]

Summary

• restore hardware H.264 as the default local/daemon codec and keep the local WebRTC/native hot path aligned with main
• keep the CI software stream profile explicit at 960 max edge / 24 fps / 1.2 Mbps / 2 bpp, with lower allowed stream-quality bounds for constrained providers
• improve simulator selection/failover when a booted simulator cannot expose a live private display
• remove the abandoned JPEG/MJPEG experiment from the net PR diff and update docs to match the H.264-only defaults

Verification

• npm run build:cli
• npm run build:client
• cargo fmt --manifest-path server/Cargo.toml --check
• git diff --check